ipynb not working

Issue Type: Bug

I have run into a few times now that ipynb notebooks will be working, and then with no apparent change to VS Code I become unable to open. The loading bar under the filename keeps looping on repeat, and I do not see any of the notebook buttons load. Previously I’ve been able to fix this by uninstalling/ reinstalling the Python and Jupyter extensions, but now I am seeing this problem persistently.

VS Code version: Code 1.57.1 (Universal) (507ce72a4466fbb27b715c3722558bb15afa9f48, 2021-06-17T13:28:32.912Z) OS version: Darwin x64 19.6.0 Restricted Mode: No

System Info

Item	Value
CPUs	Intel® Core™ i5-1038NG7 CPU @ 2.00GHz (8 x 2000)
GPU Status	2d_canvas: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	10, 7, 3
Memory (System)	16.00GB (0.21GB free)
Process Argv	-psn_0_45067 --crash-reporter-id f8c463f6-55d2-4646-a41a-4308c19c2549
Screen Reader	no
VM	0%

Extensions (5)

Extension	Author (truncated)	Version
vscode-docker	ms-	1.14.0
python	ms-	2021.6.944021595
vscode-pylance	ms-	2021.6.2
jupyter	ms-	2021.6.999406279
remote-containers	ms-	0.183.0

A/B Experiments

vsliv368:30146709
vsreu685:30147344
python383:30185418
pythonvspyt602:30300191
vspor879:30202332
vspor708:30202333
vspor363:30204092
pythonvspyt639:30300192
pythontb:30283811
pythonvspyt551cf:30311713
vspre833:30321513
pythonptprofiler:30281270
vshan820:30294714
pythondataviewer:30285071
vscus158:30321503
pythonvsuse255:30323308
vscorehov:30309549
vscod805:30301674
binariesv615:30325510
vsccppwtct:30322537

[mccrindlebrian]

After closing the tabs, reloading them seems to bring me to this new UI without issue. It might be helpful to have this occur on update to avoid confusion.

[greazer]

This problem has been resolved in Stable v1.59 and Insiders.